ISP1161 datasheet(26/127 Pages) PHILIPS

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Philips Semiconductors

ISP1161

Full-speed USB single-chip host and device controller

Product data

Rev. 01 — 3 July 2001

26 of 130

9397 750 08313

Table 5:

Philips Transfer Descriptor (PTD): bit description

Symbol

Access

Description

ActualBytes[9:0]

R/W

Contains the number of bytes that were transferred for this PTD

CompletionCode[3:0]

R/W

0000

NoError

General TD or isochronous data packet processing

completed with no detected errors.

0001

CRC

Last data packet from endpoint contained a CRC error.

0010

BitStufﬁng

Last data packet from endpoint contained a bit stufﬁng

violation.

0011

DataToggleMismatch

Last packet from endpoint had data toggle PID that did

not match the expected value.

0100

Stall

TD was moved to the Done queue because the

endpoint returned a STALL PID.

0101

DeviceNotResponding

Device did not respond to token (IN) or did not provide a

handshake (OUT).

0110

PIDCheckFailure

Check bits on PID from endpoint failed on data PID (IN)

or handshake (OUT)

0111

UnexpectedPID

Received PID was not valid when encountered or PID

value is not deﬁned.

1000

DataOverrun

The amount of data returned by the endpoint exceeded

either the size of the maximum data packet allowed

from the endpoint (found in MaximumPacketSize ﬁeld of

ED) or the remaining buffer size.

1001

DataUnderrun

The endpoint returned is less than MaximumPacketSize

and that amount was not sufﬁcient to ﬁll the speciﬁed

buffer.

1010

reserved

1011

reserved

1100

BufferOverrun

During an IN, the HC received data from an endpoint

faster than it could be written to system memory.

1101

BufferUnderrun

During an OUT, the HC could not retrieve data from the

system memory fast enough to keep up with the USB

data rate.

Active

R/W

Set to logic 1 by ﬁrmware to enable the execution of transactions by the HC. When the

transaction associated with this descriptor is completed, the HC sets this bit to logic 0,

indicating that a transaction for this element should not be executed when it is next

encountered in the schedule.

Toggle

R/W

Used to generate or compare the data PID value (DATA0 or DATA1). It is updated after

each successful transmission or reception of a data packet.

MaxPacketSize[9:0]

The maximum number of bytes that can be sent to or received from the endpoint in a

single data packet.

EndpointNumber[3:0]

USB address of the endpoint within the function.

Last(PTD)

Last PTD of a list (ITL or ATL). A logic 1 indicates that the PTD is the last PTD.

(Low)Speed

Speed of the endpoint:

S = 0 — full speed

S = 1 — low speed

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